package com.zhixinglu.www.spring.boot.qr.code.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Random;

/**
 * <p>
 * QRCodeUtil
 * </p>
 *
 * @author weixin
 * @date 2023/9/20 20:31
 */
public class QRCodeUtil {

    private static final String CHARSET = "utf-8";

    private static final String FORMAT_NAME = "JPG";

    /**
     * 二维码尺寸
     */
    private static final int QRCODE_SIZE = 300;

    /**
     * LOGO宽度
     */
    private static final int WIDTH = 60;

    /**
     * LOGO高度
     */
    private static final int HEIGHT = 60;

    /**
     * 生成二维码
     * @param qrCodeWidth {@link Integer} 二维码宽度
     * @param qrCodeHeight {@link Integer} 二维码高度
     * @param content {@link String} 二维码内容
     * @return BufferedImage
     */
    public static BufferedImage createImage(Integer qrCodeWidth, Integer qrCodeHeight, String content) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrCodeWidth, qrCodeHeight,
                    hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        return image;
    }

    /**
     * 插入LOGO
     *
     * @param source 二维码图片
     * @param imgPath LOGO图片地址
     * @param needCompress 是否压缩
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String imgPath,
                                    boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println(""+imgPath+"   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height,
                    Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 写入文件
     * @param bufferedImage {@link BufferedImage}
     * @param outputPath {@link String} 输出目录
     * @param filename {@link String} 文件名
     * @return Boolean
     */
    public static Boolean writeToFile(BufferedImage bufferedImage, String outputPath, String filename) {
        try {
            // 创建目录
            mkdirs(outputPath);

            // 生成文件
            File file = new File(outputPath + File.separator + filename);
            return ImageIO.write(bufferedImage, FORMAT_NAME, file);
        } catch (IOException e) {
            System.out.println("createImage error: " + e.getMessage());
            return false;
        }
    }

    /**
     * 写入文件
     * @param bufferedImage {@link BufferedImage}
     * @param filePath {@link String} 输出文件地址
     * @return Boolean
     */
    public static Boolean writeToFile(BufferedImage bufferedImage, String filePath) {
        try {
            // 创建目录
            mkdirs(filePath);

            // 生成文件
            File file = new File(filePath);
            return ImageIO.write(bufferedImage, FORMAT_NAME, file);
        } catch (IOException e) {
            System.out.println("createImage error: " + e.getMessage());
            return false;
        }
    }

    /**
     * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
     * @date 2013-12-11 上午10:16:36
     * @param destPath 存放目录
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            boolean mkResult = file.mkdirs();
        }
    }

    /**
     * 生成二维码
     * @param content {@link String} 二维码内容
     * @param outputPath {@link String} 输出目录
     * @param filename {@link String} 文件名
     * @return
     */
    public static Boolean encode(String content, String outputPath, String filename) {
        BufferedImage image = QRCodeUtil.createImage(QRCODE_SIZE, QRCODE_SIZE, content);
        // 创建目录
        return QRCodeUtil.writeToFile(image, outputPath, filename);
    }

    /**
     * 生成二维码
     * @param qrCodeWidth {@link Integer} 二维码宽度
     * @param qrCodeHeight {@link Integer} 二维码高度
     * @param content {@link String} 二维码内容
     * @param outputPath {@link String} 输出目录
     * @param filename {@link String} 文件名
     * @return
     */
    public static Boolean encode(Integer qrCodeWidth, Integer qrCodeHeight, String content, String outputPath, String filename) {
        BufferedImage image = QRCodeUtil.createImage(qrCodeWidth, qrCodeHeight, content);
        // 创建目录
        return QRCodeUtil.writeToFile(image, outputPath, filename);
    }

    /**
     * 生成二维码
     *
     * @param content 内容
     * @param filePath 存储地址
     */
    public static Boolean encode(String content, String filePath) {
        BufferedImage image = QRCodeUtil.createImage(QRCODE_SIZE, QRCODE_SIZE, content);
        // 创建目录
        return QRCodeUtil.writeToFile(image, filePath);
    }

    /**
     * 生成二维码
     *
     * @param qrCodeWidth {@link Integer} 二维码宽度
     * @param qrCodeHeight {@link Integer} 二维码高度
     * @param content {@link String} 二维码内容
     * @param filePath {@link String} 输出文件地址
     */
    public static Boolean encode(Integer qrCodeWidth, Integer qrCodeHeight, String content, String filePath) {
        BufferedImage image = QRCodeUtil.createImage(qrCodeWidth, qrCodeHeight, content);
        // 创建目录
        return QRCodeUtil.writeToFile(image, filePath);
    }

    public static void main(String[] args) {
        String content = "https://baidu.com";
        String directory = "/Users/weixin/workspace/IdeaProjects/spring-boot-learning/utils/spring-boot-qr-code/src/main/resources/static/";
        boolean result = encode(300, 300, content, directory + "new.jpg");
        System.out.println(result);
    }

}
